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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9285daad88b63c522bee5f0864ab65d670a5ac9962fe6b36b49c5c86e48d9d4d' 
  AND token = 'pXD04CxC/oZ7w7ApTaR4cayPAQkQ+gaXvgYkK+7EKyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}